Train-stop.



w. M.' AVERY t J. Boom..

TRAIN STOP.

APPLICATION FILED JULY I3, 1916.

.Patented J 2111.29, 1918.

/I WOM/EVS ihe port 27 'whereby eonvmunieuli a valve member 32 provided with en opening 33 adapted to normnlly register with i .is and.

inlilished beiween the engineer@ valve the train pipe and air in the lutterl vwhen the telve f atri, in n manner to presenl-ly upzeur, and {tt-il to the 'full line position snewn in s u. Fig. l, a longitudinal groove 3% formed. in' the bottoni of seid yulvo member will con neet the port 27 with e smell bleed port 35 in which position communication between the engineers valve and the trein vpipe is shut oil and the air pressure from he le;- ter permitted to escape to the ntino "1ere whereupon an epplicniien elf the seivue air brakes 'will result. T he v :ilve 3?, i* sin tained in its .norm-el dotted. line posit in ley ree-.son ef the luci', @het the pistons 230 sind 3l are of unequal areas and since the pres-y sure the air entering the easing throng@ the pipe 2G is equal in all direetions, the' larger piston 8G will he formed to its en'cl o the casing. An escape pc il ie provided.

'Sin the end Q5 of the to preventany accumulation ef pressure, owing to lenir-` sge, between the 'smell piston 8l :md seit-l eno. o easing,

Means provided lic-r producing an `inequality air presse in the eei 23 Wherelay to operate elle 'valve 32 and g. y

nhly @emo-rise 'branch pipe 37 he fing' one end connected te .iihe enel 251% of seid. easing while the other end is coupled to moin supply pipe El?. Mouneel between the e lds of the biennali pipe 37 allerea valve menig 38 in which mourned for Vertical :noveroenl, en. electrically Coni-miler). valve 39 hay ing' a transverse passage therethrough for establishing communication between the supply pipe and. the Q33 when the main or lock (.'irenitzi previously described are elosed. The closing i either oi? these ciromis operates the solenoid l? which ie een neeteii io the valve 32) to lift the. une to the full line position shown in the f lru'n'ing. Admission oi re through the pipe into 'the :nl ieeent end of the 'will iiuo'cluee un 'inequality o1 ei'r pi' ,nre

in seid which 'will canse the valve $32, :mi pist S0 une., to move to the uiv pipe liu. easing f. to lie seen llt-et t positive und cally undying' ino'tion oi the trein. v

gemeen of the trein and preventing the rel inse of .reservoir of the system and the trnin pipe.

:ind normally held open by the nir pressure from the supply pipe, :in :nixilinry vnlved connection between the said supply pipe and the valve mechanism for admitting nir from the supply pipe t'o the valve mechanism to operate. the latter against, the pressure of the :iir normally actingl thereon, and'controlling means for the auxiliary velved con neetion. actuated by the' motion of the train.

Q. ln :in autom-tic tintin stop enihmlying en nii brake system, a., vulve mechanism dispo ed between the supply pipe from ille mein reservoir of the system and the train pipo, iin-:l normally held open bythe air pressure from the supply pipe, n brunch wipe connecting the said supply pipe with the. valve mechanism, :i controlling valve .in the branch pipe normally closing the seine, and actuating means for the controlling.; valve operated by the motion of the tri.' i.

3. in en. automatic train stop en'ibodying :in ei" brake system, i valve mechanism dispos .d between the supply pipe from the mein. ervoir of the system and the train pipe and. normally held open 'ny the uit pressure from the supply pipe, un auxiliary veli/'ed connection between the Suid supply pipe and. the valve mechanism for admitting nir from the supply vpipe to the valve mechanism to operette the latter against the pressure ofthe ai: normally acting thereon, :nid 'wally operated ineens for nc'uetingthe elect.. auxiliary mlved connection operated. by the 4. iin un. nutemutie train stop embodying :in uir brake system, :i valve mechanism dis posed between the supply pipe from the main ri'iservoir of the system and the train pipe and nornfnilly held open by the air pressure from the supply pipe, :in auxiliary wilved eonnettion between the said supply 'pipe and the vulve mechanism for admitting 'air from the supply pipe to the vulve mech- `Anism to operate the latter against, the' pressure of the air normally acting thereon, und electrically mei-ated means vim' actuating the auxiliary yulved connection including :L current generator operated by the motion nf thetrain. v

5. In un automatic train stop embodying eirl rake in, a, vulve n'ieehunism (lisposed hetwecn he supply pipe from the .niain iesei'voi ei the system und the train ineliniing n piston having one face acted upon by thenir pressure frnm the supply pipe, au auxiliary vulved connection lli nanoscale controlling means for the auxiliary waivedV connection actuated by the motion of the trainn 6. ln an automatic train stop, the coinbinationtof an electric circuit, an air bralte system, means for controllingthe passage of air between the supply pipe from the main reservoir of said system' .and the train `pipe and including a casing havingpiston chambers therein of dierent areas, pistons mounted in said chambers, a valveconnecting said pistons and normally in position to permit passage of air from said supply pipe and said train pipe, means connecting said supply pipe with saidcasing for producing an` inequalityv of air pressure inthe latter whereby said valve and pistons are actuated to produce an application of the brakes, and means operated by said electric circuit ior controllingthe passage of air through the last-named means.

7. ln van automatic train stop, the confibination oi an electric circuit, an air brake lso system, means for controlling the passage of air between the supply pipe from the main reservoir of said system and the train pipe and including a casing having' piston chambers therein of diderent areas, pistons mounted in said chambers, a valve connect ing said pistons and normally in position to permit passage of air from. said supply pipe and said train pipe, means connecting said supply pipe with said casing for producing an inequality oflair pressure in the latter whereby said valve and pistons are actuated to produce an application of the brakes, and a valve 'for controlling the passage of aiir through the last-named means and normally in a position, when said electric circuit is opened, to permit oi the escape of air from said casing whereby an equality of pressure therein is maintained, said las named valve being,r operated by the closing of said electric circuit to establish communication between said supply pipe and said casing to cause air inequality of air pressure in the latter.

il. .ln an automatic train stop, the coinbination of an automatically controlled elec tric circuit, an air bralre system, means for l with said casing for producing an inequality 'diderent areas, pistons mounted in said 60 chambers, a valve connecting said pistons and normally in position to permit passage of air from said supply pipe and said trainA pipe, means connectingsaid' supply pipe Bti of air pressure in the latter whereby said valve and pistons are 'actuated to produce an application of the brakes, and means operated by said electric circuit for controllin the/'passage of air through the last-name means.

9. ln an automatic train stop, the combinati'on of an automatically controlled elec tric circuit, an air brake'systein, means' for controlling the passage ot air between fthe supply pipe from the main rservoirot'said system and the train pipe and including a casing having piston chambers therein oit different areas, pistons mounted in said chambers, a valve connectingl 4said pistons and normally inl position to permit passage' of air from said supply pipe and saioltrain pipe, means connecting said supply pipe with said casing ior-producing an inequality ot air pressure in the latter whereby saidv valve and pistons are actuated 'to produce an application ot the brakes, means operated by said electric circuit for controlling the passage et air through the last-narned means, and a second circuit for maintaining the :means controlled by first said electric circuit in position to permit of said passage of air during tbe-progress of the train.

10. Lln an automatic train stop, the coinbination of an automatic controlled electric circuit, an air brake system, means for controlling the passage of air between the supply pipe from the main reservoir of said system and the train pipe, and including a casing having; piston chambers v'tl'ierein of di'erentareas, pistons in said chambers, a Valve connecting the pistonsv and normally in position to permit passage of air from said `supply pipe and train pipe, said valve' when moved into abnormal position operat ing to close communication between the said pipes and'establish communication between the train pipe and the atmosphere, means connecting the supply pipe with the casing for producing an inequality oit air pressure in the, latter 'whereby said vali/eend pistons are actuated .to produce an application of the brakes, and means operated by the electric vcircuit for controlling the passage of air to .the last named means.

lll)

WILLUGHBY MULTGN AVERY. JOHN BlliGHAM BOOTH. 

